Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: vsock/vmci: fix UAF when peer resets connection during handshake vmci_transport_recv_connecting_server() returned err = 0 for a peer RST in its default switch arm: err = pkt->type == VMCI_TRANSPORT_PACKET_TYPE_RST ? 0 : -EINVAL; That made vmci_transport_recv_listen() skip vsock_remove_pending(), leaving the pending socket on the listener's pending_links with sk_state = TCP_CLOSE while destroy: still dropped the explicit reference taken before schedule_delayed_work(). One second later vsock_pending_work() observed is_pending=true and performed full cleanup: vsock_remove_pending() then the two trailing sock_put(sk) calls -- the first reached refcount 0 and __sk_freed the socket, and the second wrote into the freed object: BUG: KASAN: slab-use-after-free in refcount_warn_saturate Write of size 4 at addr ffff88800b1cac80 by task kworker Workqueue: events vsock_pending_work Treat peer RST like any other unexpected packet type (err = -EINVAL). All destroy: arms now return err < 0, so vmci_transport_recv_listen() removes pending from pending_links synchronously and vsock_pending_work() takes the is_pending=false / !rejected branch, dropping only its own work reference. This also closes the multi-packet race Sashiko reported on v2: pending is removed from the list before any subsequent packet can find it. The pre-existing sk_acceptq_removed() gap on the err < 0 path of vmci_transport_recv_listen() that Sashiko also noted is not introduced or changed by this patch. Tested on lts-6.12.79 with KASAN: 52/100 unpatched -> 0/100 patched.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected d021c344051af91f42c5ba9fdedc176740cbd238 before 1e19f08552b90070ed18bafb1763c78297823af6; affected d021c344051af91f42c5ba9fdedc176740cbd238 before 1dd531e28f61edd286edc486ab068f135b5ae1eb; affected d021c344051af91f42c5ba9fdedc176740cbd238 before ecda37f8faab3220da199335e42564cb7a9ad145; affected d021c344051af91f42c5ba9fdedc176740cbd238 before cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb; affected d021c344051af91f42c5ba9fdedc176740cbd238 before 47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9; affected d021c344051af91f42c5ba9fdedc176740cbd238 before 440447699c681e26ed58e9c309cad718270a18b4; affected d021c344051af91f42c5ba9fdedc176740cbd238 before 9fe74e42914c851d68069713b7b917a9c33faf26; affected d021c344051af91f42c5ba9fdedc176740cbd238 before 99e22ddf4edb63dc8382bc028af928056d3450cf |
| Linux / Linux | affected 3.9; unaffected 0 before 3.9; unaffected 5.10.258 through 5.10.*; unaffected 5.15.209 through 5.15.*; unaffected 6.1.175 through 6.1.*; unaffected 6.6.142 through 6.6.*; unaffected 6.12.92 through 6.12.*; unaffected 6.18.34 through 6.18.*; unaffected 7.0.11 through 7.0.*; unaffected 7.1 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/1e19f08552b90070ed18bafb1763c78297823af6
- https://git.kernel.org/stable/c/1dd531e28f61edd286edc486ab068f135b5ae1eb
- https://git.kernel.org/stable/c/ecda37f8faab3220da199335e42564cb7a9ad145
- https://git.kernel.org/stable/c/cc27e989a5dfdfcfc1cca7c3be27a0c7532b46cb
- https://git.kernel.org/stable/c/47e63077605c6c2aa45b3df9847a8cdc1f1f6ef9
- https://git.kernel.org/stable/c/440447699c681e26ed58e9c309cad718270a18b4
- https://git.kernel.org/stable/c/9fe74e42914c851d68069713b7b917a9c33faf26
- https://git.kernel.org/stable/c/99e22ddf4edb63dc8382bc028af928056d3450cf
ADP enrichment
No English description supplied.
No references supplied.